XF 1.5URL parameters

Active member

Hello,
I was wondering what URL parameters does it give for xenForo? I would like to create a button on my site which opens create-thread with a prepared message and title. I found out that the parameter for the title is title. What are the parameters for the other thinks like the message in the thread and the prefix or tag?

I was also wondering if or where I can find these parameters for other elements like conversations or so? Is there any list or where can I find them in the source?